Error Message

I'm new here, and not sure this is the correct place for my question. If it's not, please direct me.

I'm getting the error message "Run-time error '9', subscript out of range". In researching this error, other people getting the same message appeared to know where or what program was causing the error. I don't have a clue as to what is causing it, or where it is coming from. Is there a way I can track it down to a specific program or file? As an added note, I don't think, or at least I can't remember it's arrival being associated with the installation, removal, or modification of a program or files.
I'm running Windows XP, with SP2. I'm set up for multiple user log on, and get the message with either lon on.
Thanks in advance for the help,
Len